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Microsoft is discontinuing Windows Mixed Reality
(www.theverge.com)
This is a most excellent place for technology news and articles.
Your comparison between phones and VR/AR is reasonable but a bit different as when windows phones were discontinued, Microsoft had pretty much lost the phone os race. Also the windows phones sucked, I've used them...
IMO microsoft gave vr/ar a fair chance. They might have been early, but if we are eg. a full decade off must buy VR, then it might not be worth waiting.